Mold for making castings



smw 1, 1492s.

` J. S. THOMPSON MOLD FDR MAKING CASTINGS Filed July 21, 1924 j, .l Z Lg fag/1* Patented Sept. l, 1925.

UNITED STATES 1,552,246 PATENT OFFICE/Q JAMES` s. Tnoivrrson, orrnnfram, Yong.

MOLD ron MAKING GASTINGS.: i

Application nled July 21, Serial vvNo.k 727,191.

metalV and part refractory, as will hereafter,

appear.

lThe object yof the invention is -to provide means of simple'character Whichxcan be keasily and quickly applied forholdingin a proper position in the mold some insert which is to he embedded in the casting.

YA further object .of the invention is to provide holding means vfor' ythe "purpose aforesaid, which are adapted to' be inserted in openings in the mold and heldftherein against displacement hyfrictional engagement with the Walls Qfsaid' openings.V

' My invention -is :adaptable to molds for making lorakek shoesnand for this vpurpose Vits ohj ect is to provide simple means vvhieh canv be easily applied for holdinga reinforcing back or arv back unit-in the `cope of the niold tohe embedded in' lthe-casting.' f My invention can be lembodied in .a vvariety of forms adapted for frictional engagement to secure them in. place, `and theV inventioncan he used for making castings of many different kinds l'and in moldsk which vary greatly in construction. As a-sinmple embodiment of the'invention I have selected for illustration a brake Ashoe mold andhave shown several forms of the holding devices, as I believe this Will be suflicien'tto enable those skilled in the art tonse theinvention Wherever itr may he capable offor adapted for use and in a form indicated vgenerally hy the several forms shown. Referring to the drawings, yFig. 1 `is a longitudinal sectional viewy of afmold'ifor making brake shoes having lthe mold Cavity yfaced with. refractory in aterial and showing my invention 'Y A K Fig. 2 is a. sectionalfviexvonlthe linel2`r2 ofFigQl.V Figs. 3, l and' aredetail" erspective views of different forms'ofhol ingfdevicestha't may he employed. l I

Y Referring to the drawingathe mold com` prises a dra'g and'acopeT liavingtheein 'snperiortoknown means.

vThe .cope has f ne or more openings 12 a moldZ cavity 8 for making a *brake shoe.

As hereinbefore" stated, the mold may be madein-any desiredshape and with a mold cavity 'adapted Vfor casting articles of any kind andA shape,and the moldmay he made entirely'of metal or partfmetal land partv refractory constrnctediand arranged inr such manner as'may befound necessary or desirable to best satisfydifferent conditions'. In 'the mold illustrated,"the-mold cavity is "lined, With-refractory" material 9.

` BrakeV shoesv aref commonly provided With .a-reinforcing'steel hacklO and lug 11, which are embedded in `the bodyof the shoe v'dur- 'the v'casting operation. 'The steel back, yoi' the back andV the lug, las the'case v`may loe,

are inserted in the cope and means are proy vided for holding them in` thefcope'against displacement Whilethe mold is being closed and "vvhile'the' metal is loeing poured.v 1Varions means" have heenl provided heretofore forth-isl purpose, but .the present means are lllllexpensive and fcanbe applied aSl'IY ,and qllCkly, andin many respects are ytherein Iwhich exten'dthrough the Wall of the mold cavity ina convenientpos'ition for receiving the vholding devices to engage the steel back. A f

in' Fig. 1 r-have vniuseateaav ampie for@ of -hold-ing device which have found in practice to herv very satisfactory, and :this device'is made of Wire bent toforrn a shank 13 Aand a liooked",end'f14.y The' shank can be easily inserted inthe opening and when slightly distorted, as vshown, it vvi-llfrict-io'naljly engage the Wall of the opening to hold itself inv the' cope and-support the"back.

theform shown' in'F-ig. 1 readyfor use, or the moflder may bey provided -With Wires 'having hooked ends 14 andj hefmay' distort the shank rjusty before engaging `the device bev provided with stra-ight pwiresfto be Aloent and distort/cdas applied.

' find it convenient in casting brake shoes tol providewtfwvo 'holding devices located on VThese W-ireholding devices may be made'in 'withthe hack and cope;"lor the melder may opositeisides of the-lug, but itrriay"he found c, su

cient'tenseonly`r` one holding ,device for 'brake shoes. l

In'Fig. -3 I have shown another form', in

'muy wenn vanaaf-111i ,soneries af which is made by bending the wire on itself, and is distorted in the broad sense of my invent-ion so that when the shank is inserted in the opening 12 it will frictionally engage the wall of the opening. The ends of the wire are bent outward to form hooked ends 14. In Fig. 1 the hooked ends 14 ofthe two holding devices are inwardly directed, but the hooked ends 14 of the holding device of Fig. 3 are directed transversely of the back 10, as will be readily understood.

In'Figs. 4 and 5 I have shown holding devices made of strip metal, as illustrative of some other forms which may be used. In Fig. 4 the holding device consists of a section of strip metal bent upon itself between its ends to form thehooks 15 and having its end portions sprung slightly apart to form the shank 16. The holding device of Fig. 5 is in substantially the same form as t-hat of Fig. 1 except that it is made of strip metal with a hooked end 17 and adistorted shank 18.

I realize that these holding devices may be made in many other different forms, but in foundry practice they should be as simple as possible,inexpensive, and easy to apply, and I regard the four forms. shown as sufficient for the purposes of this application, it being understood that in the broad aspect of the invention any holding device having a shank distorted lin any form to make frictional engagement-with the vwall of the opening in the cope, and having a back engaging port-ion on the end of the shankprojecting into the mold cavity, is intended to be included within the scope of the appended'claims. I Vuse the word distorted to indicate any conformation of the shank which will provide for sufficient frictional engagement between the shank and the wall of the opening to retain the holding device in position.

I prefer that the opening 12 extend eny tirelythrou gh the cope because it will enable the opening to be readily cleaned if it should become obstructed,- and furthermore it provides a vent for the escape of gases during Y the casting operation. lIn practiceI have found that the gases do escape through this opening and the opening may be increased in size to provide a larger vent if it should be found necessary. Generally speaking, however, I prefer to make the opening 12 primarily for the purpose of receiving the holding device, and not to constitute the vent, although it will be understood,y of course, that the opening must be sufliciently larger than the holding device to permit the latter to be readily inserted and hence there will always be some venting through this opening; but I prefer'to'provide one or more vent openings 19 so that it will not be necessary lto enlarge the vent opening .12, which might, in some cases, result in metal flowing gagement of the holding device from the cope when the mold is opened.

In casting brake shoes I have found that when the mold is opened the holding device remains Vsufficiently intact to pull out of the opening after which it can be easily broken oif flush with the back of the shoe. If the holding device should be burned off where the hooked end joins the shank, during the casting operation, the shank can be readily removed from the opening by punching it out.

Vhile my invention is particularly intended for use in connection with permanent molds, it can obviously be used in some forms with satisfactory results in sand molds, and I do not wish to be considered as limiting myself to the use of the invention in a mold of any particular kind or construction. f

In casting brake lshoes in permanent molds I have found that the back and lug for a subsequent casting may be arranged and held in the cope almost immediately after the mold is opened, and while the cope is still jhot` and even before the shoe is removed from the drag, which will indicate in a general way the facility and speed with which the back and lug may be arranged in yplace for the neXt casting operation by the use of my present invention. l

I have illustrated and described the invention asused in a mold for casting brake shoes becausethis is rwhere I have used it, and it illustrates veryrwell howpthe invention is intended to be used; but I do not wish to be understood as limiting or restricting the invention to use in connection with any' particular form of casting, since I believe it can be easily adapted for holding different parts in different-molds for making a variety of castings.

I am aware that changes in the ,form and Van insert to beiembedded in a casting and comprising a hooked end to engage the insert in the mold cavity and a distorted shank to make holding engagement with the mold.y

2. The combinationy of a mold having av mold cavity and an opening, and means for supporting in the mold cavity an insert to be embedded in the casting and comprising a device arranged at one end to engage said insert and having its other end arranged in said opening to frictionally engage the wall thereof. .tlflefrillt@A and, interfering with .therdiseen5?),1'l`he combination of a mold having a mold cavity and an opening, and means for supporting in the mold cavity an insert to be embedded in the casting and comprising a device having a hooked end to engage the insert, and a distorted shank arranged in said opening to frictionally engage the Wall thereof.

4c. The combination of a mold having a mold cavity and an opening, and means for supporting in the mold cavity an insert to be embedded in the casting and comprising a Wire bent at one end to engage the insert and having its remaining portion arranged s in'said openingand distorted to rictionally engage the Wall thereof.

5. The combination of a brake shoe mold having a mold cavity and openings, and means for supporting in the mold cavity a reinforcinlg back to be embedded iny the casting and comprising a pair of devices having oppositely directed hooked ends toy engage said back, and Shanks arranged in said openings and distorted to Vfrictionally engage the Walls thereof. Y

JAMES s. THOMPSON; 

